J/ApJ/693/1484ivo://CDS.VizieR/J/ApJ/693/1484doi:10.26093/cds/vizier.16931484CDSCenko S.B.Kelemen J.Harrison F.A.Fox D.B.Kulkarni S.R.,Kasliwal M.M.Ofek E.O.Rau A.Gal-Yam A.Frail D.A.Moon D.-S.2017-12-18T07:57:30Z2011-04-07T06:42:47ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgamma-ray-astronomyinfrared-photometryvisible-astronomyphotometrybroad-band-photometryx-ray-sourcesWe present multicolor optical observations of long-duration {gamma}-ray bursts (GRBs) made over a three-year period with the robotic Palomar 60 inch telescope (P60). Our sample consists of all 29 events discovered by Swift for which P60 began observations less than 1hr after the burst trigger. We were able to recover 80% of the optical afterglows from this prompt sample, and we attribute this high efficiency to our red coverage. Like Melandri et al. (2008, Cat. J/ApJ/686/1209), we find that a significant fraction (~50%) of Swift events show a suppression of the optical flux with regard to the X-ray emission (the so-called "dark" bursts). Our multicolor photometry demonstrates this is likely due in large part to extinction in the host galaxy. We argue that previous studies, by selecting only the brightest and best-sampled optical afterglows, have significantly underestimated the amount of dust present in typical GRB environments.2009ApJ...693.1484Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/693/1484CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/690/163 : The first Swift UV-Opt GRB afterglow catalog (Roming+, 2009)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJ/686/1209 : Optical properties of GRB afterglows (Melandri+, 2008)J/ApJ/654/L21 : R-band light curves of GRB 060206 and GRB 060210 (Stanek+,J/AJ/133/1027 : Positions for 179 Swift X-ray afterglows (Butler+, 2007)J/A+A/448/L9 : Position catalogue of Swift XRT afterglows (Moretti+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/693/1484https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/693/1484http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/693/1484https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/693/1484https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/693/1484http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/693/1484GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/693/1484/table3 (P60-Swift early optical afterglow sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/693/1484/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/693/1484/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/693/1484/table3?GETtext/xml+votable180.050000true181.1049167-1.20022220.0055555555555555566/500 923 1102 3056 6004 6261 8375 9370 10094 10519 10680 10912 11673 11905 12134 13312 15054 16215 16232 17453 17814 20655 25597 25946 28063 30553 30557 31607 48007https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/693/1484?format=asciiGamma-rayX-rayOpticalInfrareddefaultJ/ApJ/693/1484/table3P60-Swift early optical afterglow samplez? Redshiftsrc.redshiftdoublenullableE_betaO? Positive error on betaOstat.error;stat.maxfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGRB name (YYMMDDA)meta.id;meta.maincharprimaryf_GRB[fg] Flag on object (1)meta.codecharP60OT?[Yes/No ] Optical transient observed with the Palomar 60 inch telescope (P60)meta.code;obscharRefOther reference for Optical or IR transient (2)meta.code;obscharr_zRedshift reference (3)meta.ref;pos.framecharalpha1? Spectral decay indice {alpha} (4)stat.fit.paramfloatnullableE_alpha1? Positive error on alpha1stat.error;stat.maxfloatnullablee_alpha1? Negative error on alpha1stat.errorfloatnullablealpha2? Spectral decay indice {alpha} (4)stat.fit.paramfloatnullableE_alpha2? Positive error on alpha2stat.error;stat.maxfloatnullablee_alpha2? Negative error on alpha2stat.errorfloatnullabletb? Burst trigger time (4)kstime.epochfloatnullableE_tb? Positive error on tbksstat.error;stat.maxfloatnullablee_tb? Negative error on tbksstat.errorfloatnullablebetaO? Spectral decay indice {beta} (4)stat.fit.paramfloatnullablee_betaO? Negative error on betaOstat.errorfloatnullablechi2? Best fit {chi}^2^ (4)stat.fit.chi2;meta.modelledfloatnullabledof? Degree of Freedom (4)stat.fit.dofintnullablel_betaOXLimit flag on betaOXmeta.code.errorcharbetaOXOptical-to-X-ray spectral index (5)phys.luminosity;arith.ratiofloatl_AVLimit flag on AVmeta.code.errorcharAV? Host extinction (6)magphys.absorptionfloatnullableE_AV? Positive error on AVmagstat.error;stat.maxfloatnullablee_AV? Negative error on AVmagstat.errorfloatnullableLCPlot the light curve from table 1 datameta.ref.urlcharSimbadSimbad column added by the CDSchar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.mainnullable_DEPositions from Simbad (declination part)degpos.eq.dec;meta.mainnullableJ/ApJ/693/1484/table1P60-Swift early optical afterglow catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGRB name (YYMMDDA)meta.id;meta.maincharr_GRBReference flag on GRB (1)meta.ref;pos.framecharObsDateDate of observation in "YYYY/MM/DD.DDDD" format UT at beginning of exposurestime.epochnullableTimeTime since burst (2)stime.intervaldoubleFiltFilter used in observation (Ic,Rc,g,i,i',z,z')instr.setup;obscharExpExposure timestime.duration;obs.exposurefloatl_magLimit flag on magmeta.code.errorcharmagObserved magnitudemagphot.magfloate_mag? Error in magmagstat.error;phot.magfloatnullabler_magReference for mag (3)meta.refchar